Transactions of Materials and Heat Treatment

Title：Influence of composite strengthening on wear resistance of back extrusion punch for H13 steel

Authors： Jiang Ding Wang Yun Li Chao Du Jinxing Lian Qiang

Unit： Jiangsu University Jiangsu Winner Machinery Co. Ltd.

KeyWords： H13 die steel back extrusion punch composite strengthening wear resistance quenching laser shock hardening

ClassificationCode：TG142；TG178

year,vol(issue):pagenumber：2019,44(9):106-112

Abstract：

For the defects of quick wearing and short service life of back extrusion punch in warm forming of H13 steel, the wear law of punch during back extrusion process was analyzed by finite element simulation, and the corresponding quick wearing area and the maximum wear quantity were obtained. Then, a composite strengthening treatment with tempering and laser shock hardening for these areas was carried out, and the surface hardness, surface topography and residual stress of these areas were evaluated before and after laser shock processing. Furthermore, a service life comparative test of back extrusion punch was conducted on the production line of tripod universal joint housing, and the chamfered arc radius R of back extrusion punch at different stages was measured by 3D contour graph in order to analyze the wear trend of die. The results show that compared to the single heat treatment strengthening, the average residual compressive stress on the die surface after composite strengthening is up to 760 MPa, the influence depth is about 0.8 mm, the surface hardness is increased by 12.5%, and the service life of die increases by 60.3%.

Funds：

国家自然科学基金资助项目(51575245, 51679112)

姜鼎（1992-），男，硕士研究生 E-mail：jdm064@163.com 通讯作者：王匀（1975-），男，博士，教授 E-mail：wangyun@ujs.edu.cn

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